Hunter Grades are hand-graded, hand-spined, and weighed to plus/minus 5 grains and spined within a 5 pound range. There is a slight annual growth ring run off. No fewer than three growth rings per shaft. Hunter Grades make an excellent arrow for hunting and target practice. Sold in dozens. Current 80-85 spine shafts are 30" long. The shafts will be nock and point tapered if you request them to be cut.